I ran in to an issue I was testing "dd command " and it wrote a file to root I killed the job before it finished. It put the file in the trash under /mnt/live/memory/changes/"not sure the rest"
then when rebooted no space to boot till I found the temp and deleted it

Sorry for short note on what happen will try more detail (what I get for staying up late with Porteus

I was running "dd if=/dev/sdb1 of=~/backup.img" of course this was writing to my root on my 12g usb drive and when I realized this I killed the process but it had got to about 9g when terminated it. after that it said I was out of space. I booted to a fresh and ran disk analyzer on it and found in "/mnt/live/memory/changes/.Trash-0/files" the backup.img. (hidden files view)

I tried empty trash both in guest and root sign on, but was empty. This also happened when tried doing an make_iso.sh and it failed. I ended up booting fresh and going in and manually deleting the files which then all was fine space was back????